It doesn't matter if I agree, as it's technically not true. The EMC behavior will NOT be the same and in case of 4 identical equipments, having an emission spectrum close to the limit, the result will exceed the limits.
If you (John) as a private person will do that, there is no problem, buy a rack or cupboard from Ikea: it's the same. But if you ask a company to assemble such as system (custom made) and sells it to you (independent of the way of invoice), the company has to accept EC liability for the result, and as such needs to assess the EMC properties (maybe test) and take suitable mitigation measures. With reference to the Guide, in such a case, one will maybe not be pursued under criminal law, but the result may not comply with the essential requirements of the EMVCD and the system may be obliged to be taken off the market. (this will happen in case of complaints only , I hope) Well this is all very theoretically, but it is important to distinguish between dumb law and technical aspects and find a balance between the two to be "due diligent". One of my relations is currently building a test rack with RF amplifiers and generators, for a total RF power of much more than 1 kW. Each of the items has a ce-mark. What do you think will be the resulting interference potential without special mitigation measures taken ? What happens to your body/head if you decide to operate 25 cell phones at the same time ? (some weird type of conference call ;<)) Each of the phones is safe, but the sum is a substantial risk. Regards, Ing. Gert Gremmen g.grem...@cetest.nl www.cetest.nl Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens John Woodgate Verzonden: Wednesday, October 28, 2009 8:01 PM Aan: EMC-PSTC Onderwerp: Re: certifying overall products vs. certifying individual constituant chassis In message <FCA549BE3ECF9D4CB8CB8576837EA4890A6D5C@ZEUS.cetest.local>, dated Wed, 28 Oct 2009, "ce-test, qualified testing bv - Gert Gremmen" <g.grem...@cetest.nl> writes: >>>Not true for identical equipment. > >>Please cite the standard or regulation that supports that opinion. > >If it were valid for a rack of equipment, then that configuration would >have been part of the test standard. Just as all operating modes, all >cable lay-out and all orientations. If multiple equipment in a rack are >not tested it is not to be considered as true. I'm sorry to persist, but this is a very important point. I suppose you agree that I can buy, say, four identical pieces of equipment, with CE mark, DoC and EMC assessment, all in order, put them on a table (even stacked one above another) and operate them without fear of violating anything. If you do agree, what changes when, instead of putting them on a table, I put them into a rack? -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Help stamp out intolerance! - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
